Re: [boost] [Containers] How about a list with O(1) splice?

Subject: Re: [boost] [Containers] How about a list with O(1) splice?
From: Dave Abrahams (dave_at_[hidden])
Date: 2011-10-05 16:29:27

on Wed Oct 05 2011, Ion Gaztañaga <igaztanaga-AT-gmail.com> wrote:

> El 05/10/2011 20:28, Phil Endecott escribió:
>> In another thread, Stephan T. Lavavej wrote:
>
>>> Two-list partial-splice is now linear time. FDIS 23.3.5.5
>>> [list.ops]/14: "Complexity: Constant time if &x == this; otherwise,
>>> linear time."
>>
>> Is there an opportunity here for Boost.Containers to provide a std::list
>> replacement that keeps the old O(1) splice and O(N) size? I can imagine
>> a lot of demand for this once people discover that their old splicing
>> code is trashed by a std library upgrade...
>
> IMHO this O(1) splice list should not have size() at all, just like
> forward_list.

Exactly.  There's room for a list with a cached size that's normally
O(1) except after a splice, but let's find out that someone needs it
before we go there.

-- 
Dave Abrahams
BoostPro Computing
http://www.boostpro.com